Operating systems

WordPress calendar widget is a tool for creating events on your website.
You can use this plugin on a widget or a page.
You can create an event and repeat it weekly, monthly, or yearly.
You can edit a lot of parameters such as the font size and font colors.

PHP Event Calendar is a modern, Ajax based, multi-user calendar/scheduling application. It supports multiple calendars, shared calendars, event drag and drop, Google Calendar import, email reminders, repeating events, multiple calendar views, and many other features. It can be customized easily to integrate into your own environment or it can be used right out of the box as a standalone event calendar/scheduling application. It supports all major Web browsers as well as mobile devices.